{"id":"e11e4cb7-1caf-48e1-bfe5-421241334f6e","shortId":"J9Y2wf","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a \"Premium API Access\" resource at the path `/api/v1/products/13/inventory`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-payable API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint returns product inventory data (product ID 13) via HTTP POST. Payment is handled through the x402 protocol: callers receive a 402 challenge containing the payment terms, construct an on-chain USDC micro-payment on Base, and attach the payment proof in an `X-PAYMENT` header. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises no API keys, no rate limits, and instant access.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response payload structure for a successful paid request is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC pay-per-call API","lowpaymentfee API","Base network API","micro-payment API","product data endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided; actual payload structure is unknown","The endpoint name 'Premium API Access' and path '/products/13/inventory' give minimal context about what data is actually returned","Cannot verify what inventory data is served without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/13/inventory","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/13/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose ('Premium API Access' for product 13 inventory) is vague and unverifiable. This is effectively a stub 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'0.02':148 '000':139 '13':89 '20':138 '402':103,211 '6':144 'Base network API' 'USDC pay-per-call API' 'access':34,39,161 'actual':215 'advertis':152 'ai/ml':65 'amount':133 'analyt':64 'api':38,60,154,171 'attach':121 'avail':199 'base':8,22,76,119,140 'base-network' 'broader':50 'call':12,26,136 'caller':100 'chain':113 'challeng':104,212 'confirm':206 'connect':180 'construct':109 'contain':105 'content':186 'crawl':202 'crypto':68 'data':63,86 'decim':145 'doc':170 'document':162 'dozen':55 'endpoint':6,20,30,61,82,204 'equal':147 'exampl':198 'extrem':167 'financ':67 'gate':3,17 'handl':95 'header':130 'http':91 'id':88 'infer':66 'instant':160 'inventori':5,19,85 'key':155 'limit':158 'live':207 'lowpaymentfee API' 'lowpaymentfee.com':32,52 'maximum':132 'micro':116 'micro-pay':115 'micro-payment API' 'network':77 'no-api-key' 'offer':54 'on-chain':111 'openapi':190 'page':175 'paid':222 'part':47 'path':43 'pay':10,24 'pay-per-cal':9,23 'pay-per-request' 'payabl':59 'payload':217 'payment':93,107,117,123,129 'per':11,25,135 'platform':51,151 'post':92 'premium':37 'price':172 'product':4,18,84,87 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':182 'proof':124 'proper':210 'protocol':99 'provid':33 'rate':157 'readm':174 'receiv':101 'render':177 'request':223 'request/response':193 'requir':134 'resourc':40 'respons':216 'return':83,208 'schema':194 'servic':71 'settl':73 'site':165 'span':62 'spec':191 'specif':81 'structur':218 'substant':185 'success':221 'term':108 'thin':168 'unit':141 'unknown':225 'usag':197 'usd':149 'usdc':14,28,79,114,143 'usdc-micropayment' 'use':78 'util':70 'via':90 'wallet':181 'x':128 'x-payment':127 'x402':2,16,58,98 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payable':57 'x402-payment'","prices":[{"id":"ba8c8539-dafc-4d1a-b11e-a28117114367","listingId":"e11e4cb7-1caf-48e1-bfe5-421241334f6e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/13/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:59.788Z"}],"sources":[{"listingId":"e11e4cb7-1caf-48e1-bfe5-421241334f6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/13/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:59.788Z","lastSeenAt":"2026-04-22T18:30:49.129Z"}],"details":{"listingId":"e11e4cb7-1caf-48e1-bfe5-421241334f6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/13/inventory\n# Returns 402 with x402 challenge. Attach X-PAYMENT header with signed USDC payment proof on Base to complete the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/13/inventory"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/13/inventory"}],"useCases":["Querying real-time product inventory data for product ID 13 via a single micro-payment","Integrating pay-per-call inventory checks into an autonomous agent workflow","Demonstrating x402 protocol usage for commerce data retrieval"],"bestFor":["Agents or services needing on-demand inventory lookups without subscription commitments","Developers experimenting with x402 micro-payment protocol on Base","Low-volume, pay-as-you-go product data consumers"],"notFor":["High-volume inventory monitoring requiring bulk or subscription pricing","Users who need detailed API documentation or response schema guarantees before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.118Z"},"updatedAt":"2026-04-22T18:30:49.129Z"}}